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This study is measuring adult men’s testosterone levels, not children’s. Boys don’t even produce that much testosterone until puberty.

This study has more to say in comparing adult men today to their grandfathers.

There is also correlation of the elimination of Lead Paint to violent crime. So that may need to be taken into account.

Lead Paint elimination started in the Early 70s IIRC, so the same time period :)

I think the study you might be thinking of shows a drop in crime due to the reduction of lead in gasoline, thus we are now breathing less lead.

less bold? what do you mean?

less willing to take risks and be independent. less active and staying at home for more time. but thats almost all down to controlling parents who teach their kids to be scared of everything and dont let them go out alone, and the news channels feeding that fear.

some of it might also be social media (fear of public embarrassment) but one thing its definitely not is any kind of large scale hormonal change. culture beats biology almost every time when it comes to social behavior and there is no evidence that its different in this case.